Java 8 Elvis 运算符中的空检查? [英] Null check in Java 8 Elvis operator?

问题描述

问题:Elvis 运算符 是否计划在未来的任何 Java 版本中实现?或者是否有任何库将其引入 Java?

Question: Is there an implementation of the Elvis operator scheduled for any future Java release? Or is there any Library that brings it to Java?

我已经读过了

它是为 Java SE 7 提出的，但没有进入那个版本

it was proposed for Java SE 7 but didn't make it into that release

http://www.oracle.com/technetwork/articles/java/java8-optional-2175753.html

我知道 Java 8 允许这样做

I know Java 8 allows this

String name = computer.flatMap(Computer::getSoundcard)
                          .flatMap(Soundcard::getUSB)
                          .map(USB::getVersion)
                          .orElse("UNKNOWN");

但我觉得有点过分了.因此，如果有人能指出任何将 Groovy 之类的/C# 之类的语法引入 Java 以进行 Null 检查的项目/库，我将不胜感激.

but I it's s bit too much for my taste. SO if anyone could point me out any project / library that would bring the Groovy like/C# like syntax to Java for Null Checks, would be greatly appreciated.

猫王接线员的意思是:

String version = computer?.getSoundcard()?.getUSB()?.getVersion();

或类似的

推荐答案

没有.目前或未来没有计划重新考虑 Java 中的空安全运算符.

No. There are no current or future plans to reconsider the null-safe operators in Java.

这篇关于Java 8 Elvis 运算符中的空检查?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！